Keep in mind: Garmin "X" series GPSr's use microSD cards, NOT regular SD cards. The largest microSD (aka "Transflash") card I've heard of is a 4GB.
Also, you will very likely reach your map tile limit before the memory limit of the card if you use large cards. These units can only access somewhere around 1500 map segments or "tiles."
While they do make maps with larger tiles to counter this, many of Garmin's map products are still "small tile."
Thanks af, appreciate the input and the quick response.
I was about to buy a 2GB, then I came across this 6GB on Sandisk. http://www.sandisk.com/Products/Item(2447)...roSDHC_6GB.aspx
I'm more worried about the speed in reading the card and drawing the map, but correct me if I'm wrong, that would have more to do with the speed of the card then it would with the GPS. Correct?
Thanks again.